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Editorial Team
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Asked: 2026-05-28T17:39:00+00:00

We know it’s possible to look up the IP of a visitor using JSON

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We know it’s possible to look up the IP of a visitor using JSON and a callback, as seen here Can I perform a DNS lookup (hostname to IP address) using client-side Javascript? and also at http://news.ycombinator.com/item?id=1896015 – but what about a similar thing for the user agent?

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  1. Editorial Team

    This string is directly available in navigator.userAgent. However, this string is not very reliable, because the user can easily modify it. Only use it for non-critical purposes.

    If you want to detect the user agent, so that you “know” what’s supported, you’d better switch to capability-detection.

    Examples of alternative methods to detect the browser:

    • IE: Conditional comments (HTML (also includes IE version) or in JScript)
    • Firefox / Webkit / Opera: Setting a CSS property with a vendor-prefix, and checking for the existence of the just-set property.
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